But to most of the cosmos, we're just a dot in the vast ether, too. From 804,000 miles away, we can still see Earth in its ...

The Earth has a layered structure made up of the core, the mantle and the crust. Different elements are present in different parts of the Earth’s structure. The crust is made from enormous ...

An image released from the European Space Agency (ESA) shows a rare perspective of Earth 180 million miles away on Mars.